Improvement in locking-latches



UT "STATES PATENT OFFICE.

FRANK \V. FOLSOM, OF TAYLORS FALLS, MlNNESOlA.

IMPROVEMENT IN LOCKING-LATCYHES.

Specification forming part of Letters Patent No. 152,475, dated June 30, 1874; application tiled May 9, 1874.

To all fit-kom it may concern:

Be it known that I, FRANK W. FoLsoM, of Taylors Falls, in the County ot' Ghisago, and State of Minnesota, have invented a new and Improved DoorLock, ot' which the following is a specification In the accompanying drawing, Figure l represents a front view of my improved doorlock, with top plate detached; and Fig. 2 a vertical transverse section ot' the same on the line c c, Fig. l.

Similar letters of reference indicate corresponding parts.

The object of my invention is to furnish a simple, strong', and convenient doorlock, which is not liable to get out of order, takes up less room than the locks at present in use, and serves, by the use ot' one bolt and spring only, the double purpose ot' being opened and closed by the door-knob and locked by the key. My invention consists ot' a door-lock, with a single bolt, operated by a spiral spring acting in either direction, and recessed to be acted upon by door knob and key, so that when locked by the latter one or more hooks, pivoted to the bolt, catches over the recessed inclined end ot' a horizontal guide-plate, and admit only the withdrawing ofthe bolt by releasing the hooks from the guide-plate.

In the drawing, A represents the casing, and B the bolt, ot' my improved door-lock. The rear end ot" bolt B is anged and recessed for sliding along the shank G of .the door handle or knob, as carried back by the cross-bar C acting on the rear flanges. The middle part of bolt B is provided with a wider recess, a, and smaller slotted extension a', the former for placing the strong spiral spring D therein, the latter for sliding the bolt along the spring-supporting pins or standards d. The action ot' spring D on either side ot' the boltB carries the bolt back into its original position, whether being operated by the doorknob or by the key. A rectangular recess, o, along the upper fore part of the bolt B, is equal to the distance of the cross-bar C to the rear tlanges, and allows thereby the forward motion ot' the bolt by means of the key acting on a shoulder, e', at the lower front part of the same. One or more pivoted catch-hooks,

- E, are applied to suitable recesses of the lower middle part of the bolt and slide during the fore and return motion ot' the same, caused by the knob, with their hook ends along a horizontal guide-plate, F. The front end of guideplate has a slight downward inclination, and as many slots as there are hooks E, whose ends are formed with nearly the same angle of inclination to the body of the same, for the purpose of producing an rintimate interlocking ot' hooks and guide-plate when vthe bolt is carried forward far enoughto admit ot' their dropping into the recessed end. The key is recessed to correspond'with the number of hooks, and passes exactly between the inclined end of the guideplate, being placed in such a manner into the lock that it clears the recesses of the guide-plate and acts on the shoulders c ot the bolt, carrying the same forward and locking the door. This carries also the hooks E forward far enough to drop with their ends into the recesses ot' the guideplate, and keep the bolt locked in the forward position thereby attained.

For unlocking the bolt the key is required to be turned in the same direction as before, so as to raise thereby the catch-hooks out ot' the recesses until the hook-ends are carried by the simultaneous action of the spring' on the bolt onto the horizontal part of the guideplate, and thence along the same to the original position.

The simplicity of the lock makes it less liable to get out of order, and allows its cheaper manufacture, while the mode ot locking the bolt by the catch-hooks renders it very didi cult to open, and secures thereby the bolt more completely than by the common con struction.

A suicient variety of keys maybe produced by increasing the number and size ot' the hooks, so that each key can only open the lock for which it is made.

Having thus described my invention, I claim as new and `desire to secure by Letters Pat ent- The combination of bolt B, having pivoted hooks E, and double-acting spring D, with recessed end of horizontal plate F, and r'ccessed key, for releasing the hooks and carrybolt back for unlocking, substantially in the manner and for the purpose described.

FRANK XVM. FOLSOM.

Witnesses:

w. n. e. Bonson, O. Roos. 

